Green Fluorescent Magnetic Powder can be used with a variety of forensic light sources, including the Spex Mini-CrimeScope and the ORION-LITE LED. Powder should be applied with a magnetic applicator. Black backing cards may be used to provide a sharp contrast with the resulting ridge detail. NOTE: To prevent clumping, our powders include a desiccant canister inside each jar with a capacity for absorbing moisture.